Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Experimental analysis of the heat and mass transfer of a flat sheet module of direct contact membrane distillation (DCMD) for desalination.
Submission Author:
Cristiane Mesquita , RJ
Co-Authors:
Cristiane Mesquita, Ingrid Curcino, Abdul Orlando Cárdenas Gómez, Joao Alves de Lima, Carolina Palma Naveira Cotta, Renato Machado Cotta
Presenter: Cristiane Mesquita
doi://10.26678/ABCM.ENCIT2022.CIT22-0325
Abstract
The growing interest in membrane distillation (MD) as a promising and competing technology in desalination is mainly due to (i) the ability to provide rejection of non-volatile feed solutes very close to 100%, and; (ii) operation at ambient pressure and temperatures, favoring the use of low exergy heat sources, heat from solar collectors and photovoltaic panels of high concentration. Experimental benches allow the characterization of a single membrane in a controlled environment through the reproduction of operational temperature conditions (60-90 °C). Among all MD configurations, the DCMD (Direct Contact Membrane Distillation) is the most suitable for laboratory-scale studies; its simplicity of installation and operation and small number of process parameters make it more suitable for the characterization and evaluation performance of different types of membranes. In this context, the study presents a theoretical-experimental analysis of the heat and mass transfer process in a DCMD module. The experiments were carried out in a flat sheet module under operating conditions reproduced according to the 2k factorial experimental design, with different levels of NaCl concentration in the feed solution, where the distillate mass flux obtained experimentally were compared with the results obtained through a theoretical model for distillate flux prediction. Overall, the theoretical and experimental results showed good agreement with each other, and with similar works with the DCMD configuration, such as a decrease in the permeate flux with the increase of the salinity in the feed solution, although they indicate that there is a slight underestimation by the theoretical lumped model, which can be attributed to the simplifications in the model’s design and inaccuracies of the input data of the membrane (thickness, contact angle, porosity and pore size distribution).
Keywords
Desalination;, Direct contact membrane distillation, Heat and mass transfer, Membrane, tortuosity
